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HTML

              
                <head>
  <meta name="viewport" content="width=device-width,initial-scale=1.0">
  <!--==============レイアウトを制御する独自のCSSを読み込み===============-->
  <link rel="stylesheet" type="text/css" href="https://dl.dropbox.com/s/0z920nydj51coo7/reset3.css?dl=0">
  <!--==============スライダープラグイン「slick」のCSSを読み込み===============-->
  <link rel="stylesheet" type="text/css" href="https://cdn.jsdelivr.net/npm/slick-carousel@1.8.1/slick/slick.css">
</head>

<body>

  <div class="wrapper">
    <h1>Gallery</h1>
    <p>使用したライブラリ:<a href="https://kenwheeler.github.io/slick/" target="_blank">https://kenwheeler.github.io/slick/</a></p>
    <!-- メイン画像部分 -->
    <ul class="gallery">
      <li><img src="https://assets.codepen.io/6329135/img_01.jpg" alt=""></li>
      <li><img src="https://assets.codepen.io/6329135/img_02.jpg" alt=""></li>
      <li><img src="https://assets.codepen.io/6329135/img_03.jpg" alt=""></li>
      <li><img src="https://assets.codepen.io/6329135/img_04.jpg" alt=""></li>
      <li><img src="https://assets.codepen.io/6329135/img_05.jpg" alt=""></li>
      <li><img src="https://assets.codepen.io/6329135/img_06.jpg" alt=""></li>
    </ul>
    <!-- サムネイル画像部分 -->
    <ul class="choice-btn">
      <li><img src="https://assets.codepen.io/6329135/img_01.jpg" alt=""></li>
      <li><img src="https://assets.codepen.io/6329135/img_02.jpg" alt=""></li>
      <li><img src="https://assets.codepen.io/6329135/img_03.jpg" alt=""></li>
      <li><img src="https://assets.codepen.io/6329135/img_04.jpg" alt=""></li>
      <li><img src="https://assets.codepen.io/6329135/img_05.jpg" alt=""></li>
      <li><img src="https://assets.codepen.io/6329135/img_06.jpg" alt=""></li>
    </ul>

    <!--/wrapper-->
  </div>
  <script src="https://code.jquery.com/jquery-3.4.1.min.js" integrity="sha256-CSXorXvZcTkaix6Yvo6HppcZGetbYMGWSFlBw8HfCJo=" crossorigin="anonymous"></script>
  <script src="https://cdn.jsdelivr.net/npm/slick-carousel@1.8.1/slick/slick.min.js"></script>
              
            
!

CSS

              
                @charset "utf-8";

/*==================================================
スライダーのためのcss
===================================*/

/*画像の横幅を100%にしてレスポンシブ化*/
img {
  width: 100%;
  height: auto;
  vertical-align: bottom; /*画像の下にできる余白を削除*/
}

/*メイン画像下に余白をつける*/
.gallery {
  margin: 0 0 5px 0;
}

/*矢印の設定*/

/*戻る、次へ矢印の位置*/
.slick-prev,
.slick-next {
  position: absolute; /*絶対配置にする*/
  z-index: 3;
  top: 42%;
  cursor: pointer; /*マウスカーソルを指マークに*/
  outline: none; /*クリックをしたら出てくる枠線を消す*/
  border-top: 2px solid #ccc; /*矢印の色*/
  border-right: 2px solid #ccc; /*矢印の色*/
  height: 25px;
  width: 25px;
}

.slick-prev {
  /*戻る矢印の位置と形状*/
  left: 2.5%;
  transform: rotate(-135deg);
}

.slick-next {
  /*次へ矢印の位置と形状*/
  right: 2.5%;
  transform: rotate(45deg);
}

/*選択するサムネイル画像の設定*/

.choice-btn li {
  cursor: pointer;
  outline: none;
  background: #333;
}

.choice-btn li img {
  opacity: 0.4; /*選択されていないものは透過40%*/
}

.choice-btn li.slick-current img {
  opacity: 1; /*選択されているものは透過しない*/
}

/*========= レイアウトのためのCSS ===============*/
/*エリア全体を中央寄せ*/
.wrapper {
  width: 94%;
  max-width: 900px;
  margin: 0 auto;
}

ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

a {
  color: #333;
}

a:hover,
a:active {
  text-decoration: none;
}

h1 {
  text-align: center;
  font-size: 6vw;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin: 30px 0;
}

p {
  margin: 30px 0;
  word-wrap: break-word;
}

              
            
!

JS

              
                //上部画像の設定
$(".gallery").slick({
  infinite: true, //スライドをループさせるかどうか。初期値はtrue。
  fade: true, //フェードの有効化
  arrows: true, //左右の矢印あり
  prevArrow: '<div class="slick-prev"></div>', //矢印部分PreviewのHTMLを変更
  nextArrow: '<div class="slick-next"></div>', //矢印部分NextのHTMLを変更
  asNavFor: ".choice-btn" //連動させるサムネイルのクラス名
});

//選択画像の設定
$(".choice-btn").slick({
  infinite: true, //スライドをループさせるかどうか。初期値はtrue。
  slidesToShow: 4, //表示させるスライドの数
  focusOnSelect: true, //フォーカスの有効化
  prevArrow: '<div class="slick-prev"></div>', //矢印部分PreviewのHTMLを変更
  nextArrow: '<div class="slick-next"></div>', //矢印部分NextのHTMLを変更
  asNavFor: ".gallery" //連動させるスライドショーのクラス名
});

              
            
!
999px

Console